| | Washington County | OR | 41067 | | Portland-Vancouver-Hillsboro,
OR-WA 38900 | Portland-Vancouver-Salem,
OR-WA 440 | Central | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=WashingtonCounty+OR |
| | Yamhill County | OR | 41071 | | Portland-Vancouver-Hillsboro,
OR-WA 38900 | Portland-Vancouver-Salem,
OR-WA 440 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=YamhillCounty+OR |
| | Douglas County | OR | 41019 | | Roseburg, OR 40700 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=DouglasCounty+OR |
| | Marion County | OR | 41047 | | Salem, OR 41420 | Portland-Vancouver-Salem,
OR-WA 440 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=MarionCounty+OR |
| | Polk County | OR | 41053 | | Salem, OR 41420 | Portland-Vancouver-Salem,
OR-WA 440 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=PolkCounty+OR |
| | Wasco County | OR | 41065 | | The Dalles, OR 45520 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=WascoCounty+OR |